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摘要本文以企业应用为目的，针对柴油机主要零部件的结构及失效形式，采用激光表面淬火、合金化、表面熔覆等技术进行零件表面强化处理，寻求更有效、更经济、更方便地提高柴油机主要零部件表面性能及使用寿命的工艺方案。 通过查阅国内外文献，本文总结了激光表面强化技术的特点、应用领域、成熟度和缺陷；制定了缸套内表面激光淬火、连 杆裂纹激光熔覆修补、 活塞环槽激光表面合金化、活塞顶激光表面熔覆、曲轴轴颈和轴颈圆角激光表面淬火、激光表面熔覆曲轴修复等柴油机关键零件的表面强化（修复）工艺；通过对激光设备和激光表面强化设备厂家的调研，进行了激光表面强化实验室设备的选型；通过对生产车间、实验室的实地考察，设计了激光表面强化实验室仪器设备布置的初步方案。 50122
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毕业论文关键字：柴油机关键零件 激光表面强化 实验装置 方案设计
Abstract In this paper, for the purpose of enterprise applications and seeking more effective, more economical and more convenient process scheme to improve engine parts performance and service life, directing to the structure and failure modes of diesel engine key parts, technology like laser surface hardening, alloying, cladding etc. is applied to strengthen the parts’ surface. Through accessing to domestic and foreign literature, the characteristics, application areas, maturity and defects of laser surface hardening technology is collated. Surface strengthening (repairing) process for engine key parts like laser surface hardening for cylinder inner surface, laser surface cladding for rod crack repair, laser surface alloying for piston ring groove, laser surface cladding for piston crown, laser surface hardening for crankshaft journal and the journal fillet, laser surface cladding for crankshaft repair is formulated. Through the investigation of laser equipment and laser surface hardening equipment manufacturers, the selection of laser surface hardening laboratory equipment is decided. Through the field survey to workshops and laboratories, the preliminary plan for the layout of laser surface hardening laboratory equipment is made.
Keywords: Key parts of diesel engine, Laser surface strengthening, Experimental apparatus，Program design
目录
第一章绪论1
1.1研究背景.1
1.2激光表面改性的发展现状1
1.2.1国外的发展现状1
1.2.2国内的发展现状..2
1.3激光表面改性的加工特点.3
1.4激光表面改性工程化应用面临的问题4
1.5本文的主要内容.4
第二章激光表面改性典型技术简介5
2.1激光表面淬火.5
2.2激光表面熔覆.7
2.3激光表面熔凝..10
2.4激光表面合金化.11
2.5激光冲击硬化..12
2.6激光表面非晶化.13
2.7几种激光表面改性技术的参数..14
第三章激光表面改性技术在柴油机零件上的应用..15
3.1概述.15
3.2汽缸套的制造材料和激光强化工艺设计16
3.2.1汽缸套的制造材料17
3.2.2汽缸套的激光强化工艺设计17
3.3连杆的制造材料和激光强化工艺设计.21
3.3.1连杆的制造材料.22
3.3.2连杆的激光强化工艺设计24
3.4活塞的制造材料和激光强化工艺设计.26
3.4.1活塞的制造材料.27
3.4.2活塞的激光强化工艺设计28
3.5曲轴的制造材料和激光强化工艺..29
3.5.1曲轴的制造材料.30
3.5.2曲轴的激光强化工艺设计31
第四章实验室仪器设备选型33
4.1机床的选择33
4.2激光器的选择..34
4.2.1激光器种类及特性..35
4.2.2激光器的选择方案..37